To extract all valid email addresses from the given text, you can use the following regex pattern: \b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b Using this regex pattern and the `re` module in Python, you can extract the valid email addresses as follows: ```python import re text = """Contact information: 1. John Doe - john.doe@example.com 2. Jane Smith - jane@smith-family.net 3. support@company.co.uk 4. info@subdomain.example.org 5. Invalid email: not.an.email.com 6. Another invalid: @missing-username.com""" pattern = r"\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b" email_list = re.findall(pattern, text) # remove whitespaces and join with commas emails = ', '.join(email_list) print(emails) ``` The script will output the following comma-separated list of valid email addresses: ``` john.doe@example.com, jane@smith-family.net, support@company.co.uk, info@subdomain.example.org ```